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29 * @Id: menu_driver.3x,v 1.24 2018/07/28 22:08:59 tom Exp @
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41 <H1 class="no-header">menu_driver 3x</H1>
43 <STRONG><A HREF="menu_driver.3x.html">menu_driver(3x)</A></STRONG> <STRONG><A HREF="menu_driver.3x.html">menu_driver(3x)</A></STRONG>
48 </PRE><H2><a name="h2-NAME">NAME</a></H2><PRE>
49 <STRONG>menu_driver</STRONG> - command-processing loop of the menu system
52 </PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
53 <STRONG>#include</STRONG> <STRONG><menu.h></STRONG>
54 int menu_driver(MENU *menu, int c);
57 </PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
58 Once a menu has been posted (displayed), you should funnel input events
59 to it through <STRONG>menu_driver</STRONG>. This routine has three major input cases:
61 <STRONG>o</STRONG> The input is a form navigation request. Navigation request codes
62 are constants defined in <STRONG><form.h></STRONG>, which are distinct from the key-
63 and character codes returned by <STRONG><A HREF="curs_getch.3x.html">wgetch(3x)</A></STRONG>.
65 <STRONG>o</STRONG> The input is a printable character. Printable characters (which
66 must be positive, less than 256) are checked according to the pro-
67 gram's locale settings.
69 <STRONG>o</STRONG> The input is the KEY_MOUSE special key associated with an mouse
72 The menu driver requests are as follows:
78 Move right to an item.
99 Move to the first item.
102 Move to the last item.
105 Move to the next item.
108 Move to the previous item.
111 Select/deselect an item.
114 Clear the menu pattern buffer.
117 Delete the previous character from the pattern buffer.
120 Move to the next item matching the pattern match.
123 Move to the previous item matching the pattern match.
125 If the second argument is a printable character, the code appends it to
126 the pattern buffer and attempts to move to the next item matching the
127 new pattern. If there is no such match, <STRONG>menu_driver</STRONG> returns <STRONG>E_NO_MATCH</STRONG>
128 and deletes the appended character from the buffer.
130 If the second argument is one of the above pre-defined requests, the
131 corresponding action is performed.
134 </PRE><H3><a name="h3-MOUSE-HANDLING">MOUSE HANDLING</a></H3><PRE>
135 If the second argument is the KEY_MOUSE special key, the associated
136 mouse event is translated into one of the above pre-defined requests.
137 Currently only clicks in the user window (e.g., inside the menu display
138 area or the decoration window) are handled.
140 If you click above the display region of the menu:
142 <STRONG>o</STRONG> a REQ_SCR_ULINE is generated for a single click,
144 <STRONG>o</STRONG> a REQ_SCR_UPAGE is generated for a double-click and
146 <STRONG>o</STRONG> a REQ_FIRST_ITEM is generated for a triple-click.
148 If you click below the display region of the menu:
150 <STRONG>o</STRONG> a REQ_SCR_DLINE is generated for a single click,
152 <STRONG>o</STRONG> a REQ_SCR_DPAGE is generated for a double-click and
154 <STRONG>o</STRONG> a REQ_LAST_ITEM is generated for a triple-click.
156 If you click at an item inside the display area of the menu:
158 <STRONG>o</STRONG> the menu cursor is positioned to that item.
160 <STRONG>o</STRONG> If you double-click an item a REQ_TOGGLE_ITEM is generated and
161 <STRONG>E_UNKNOWN_COMMAND</STRONG> is returned. This return value makes sense,
162 because a double click usually means that an item-specific action
163 should be returned. It is exactly the purpose of this return value
164 to signal that an application specific command should be executed.
166 <STRONG>o</STRONG> If a translation into a request was done, <STRONG>menu_driver</STRONG> returns the
167 result of this request.
169 If you clicked outside the user window or the mouse event could not be
170 translated into a menu request an <STRONG>E_REQUEST_DENIED</STRONG> is returned.
173 </PRE><H3><a name="h3-APPLICATION-DEFINED-COMMANDS">APPLICATION-DEFINED COMMANDS</a></H3><PRE>
174 If the second argument is neither printable nor one of the above pre-
175 defined menu requests or KEY_MOUSE, the drive assumes it is an applica-
176 tion-specific command and returns <STRONG>E_UNKNOWN_COMMAND</STRONG>. Application-
177 defined commands should be defined relative to <STRONG>MAX_COMMAND</STRONG>, the maximum
178 value of these pre-defined requests.
181 </PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
182 <STRONG>menu_driver</STRONG> return one of the following error codes:
184 <STRONG>E_OK</STRONG> The routine succeeded.
186 <STRONG>E_SYSTEM_ERROR</STRONG>
187 System error occurred (see <STRONG>errno</STRONG>).
189 <STRONG>E_BAD_ARGUMENT</STRONG>
190 Routine detected an incorrect or out-of-range argument.
192 <STRONG>E_BAD_STATE</STRONG>
193 Routine was called from an initialization or termination function.
195 <STRONG>E_NOT_POSTED</STRONG>
196 The menu has not been posted.
198 <STRONG>E_UNKNOWN_COMMAND</STRONG>
199 The menu driver code saw an unknown request code.
201 <STRONG>E_NO_MATCH</STRONG>
202 Character failed to match.
204 <STRONG>E_REQUEST_DENIED</STRONG>
205 The menu driver could not process the request.
208 </PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
209 <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="menu.3x.html">menu(3x)</A></STRONG>, <STRONG><A HREF="curs_getch.3x.html">getch(3x)</A></STRONG>.
212 </PRE><H2><a name="h2-NOTES">NOTES</a></H2><PRE>
213 The header file <STRONG><menu.h></STRONG> automatically includes the header files
214 <STRONG><curses.h></STRONG>.
217 </PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
218 These routines emulate the System V menu library. They were not sup-
219 ported on Version 7 or BSD versions. The support for mouse events is
223 </PRE><H2><a name="h2-AUTHORS">AUTHORS</a></H2><PRE>
224 Juergen Pfeifer. Manual pages and adaptation for new curses by Eric S.
229 <STRONG><A HREF="menu_driver.3x.html">menu_driver(3x)</A></STRONG>
233 <li><a href="#h2-NAME">NAME</a></li>
234 <li><a href="#h2-SYNOPSIS">SYNOPSIS</a></li>
235 <li><a href="#h2-DESCRIPTION">DESCRIPTION</a>
237 <li><a href="#h3-MOUSE-HANDLING">MOUSE HANDLING</a></li>
238 <li><a href="#h3-APPLICATION-DEFINED-COMMANDS">APPLICATION-DEFINED COMMANDS</a></li>
241 <li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li>
242 <li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>
243 <li><a href="#h2-NOTES">NOTES</a></li>
244 <li><a href="#h2-PORTABILITY">PORTABILITY</a></li>
245 <li><a href="#h2-AUTHORS">AUTHORS</a></li>